Drum for vacuum-pans.



No. 727,317. PATENTED MAY 5, 1903.

M. EKENBERG. DRUM FOR VACUUM BANS.

APPLICATION FILED OUT. 22, 1902.

NO MODEL.

i j i g 12 if? 7 WITNESSES: INVENTOR 44 BY 7 ATTORNEY U NTTn STATESPatented May 5, 1903.

PATENT DFFICE.

MARTIN EKENBERG, OF STOOKHOLM, SWEDEN, ASSIGNOR TO MARTIN EKENBERGSAKTIEBOLAG, OF STOOKHOLM, SWEDEN.

DRUM FOR VACUUM-FANS.

SPECIFIGATIQN forming part of Letters Patent No. 727,317, dated May 5,1903.

Application filed October 22,1902.

To all whom, it may concern:

Be it known that I, MARTIN EKENBERG, a subject of the King of Sweden andNorway, and a resident of Stockholm, Sweden, have invented certain newand useful Improvements in Drums for Vacuum-Pans, of which the followingis a specification.

This invention relates to a vacuum evaporating apparatus; and the objectis in part to produce an especially light drum having an extendedevaporating-surface and in part to improve the means for utilizing theheating medium or fluid.

In the accompanying drawings, which serve to illustrate an embodiment ofthe invention, Figure 1 is a longitudinal vertical mid-section of theapparatus, and Fig. 2 is a vertical transverse section of same at line00 in Fig. 1.

In the drawings,1 designates a vacuum-pan. 2 designates the pipe forsupplying thereto a liquid L to be evaporated, and 3 designatesthejoutlet-pipe for the vapors, to be drawn off by a pump or the like.(Not shown.) Within the chamber in the pan is rotati vely mounted ahollow shaft 7, which carries a drum of peculiar construction. This drumis essentially hollow and consistsof two end plates 6 6, which are fixedon the shaft 7 and at their outer margins are rigidly con-. nected toinner cylindrical plates 5 5, which are secured at their respective ends(see at y in Fig. 1) to an outer cylindrical plate 4, thus forming anannular cylindrical space between the plates 1 and 5. The said annularspace is divided by a circumferentially-disposed cylindricalbaffle-plate 12, which is carried by a plurality of tubular radialspokes or arms 11.

The tubular shaft 7 is in two alined parts or sections, which areconnected within the drum or between the end plates 6 6 by a hollow hub8, in which are set the tubular spokes or arms 11, and in this hub is acrosspartition 9 and a port or ports or apertures 10, situated at oneside of said partition, which apertures open into the hollow of the drumbetween the end plates 6 6.

The object is to heat the outer face of the drum formed by the plate atuniformly, and to effect this object the vapor or heating me- Serial No.128,224. (No model.)

dium enters the hollow shaft 7 at the left in Fig. 1 and flows (seearrows) from the said shaft through the ports 10 into the drum and outto the annular space between the plates 4 and 5. The baffle-plate 12compels the fluid medium to flow laterally and around its ends into thespace between the plates 4: and 12, thence it flows back to the pointswhere the hollow arms 11 open through the baffle-plate 12, thence itflows inward radially through said arms as ducts to the hollow of thehub 8 at the outlet side of the partition 9, and thence out through thesection of the shaft 7. (Seen at the right in Fig. 1.) Thus acontinuous' circulation of the heating fluid or medium is effected in amanner to uniformly heat the plate 4 of the drum.

Preferably the end plates will be concave exteriorly.

The arms or spokes 11 serve the purpose of carrying the baffle-plate 12and also as radial ducts.

The rotating drum dips into the liquid L to be evaporated, and as itrotates the partially-dried film formed on its surface is removed by ascraper 13 and falls into a receptacle 14. The vapors resulting from theevaporation are drawn off at 3 in a known way, and any liquid carriedover and condensed flows back into the pan at an inlet 15.

The arrangement described,where the heating medium enters at the left inFig. 1, tends to heat the end plates 6 6 and inner plate 5 to a highertemperature than the plate 4, which-may be in some cases advantageous;but if it be desired to reverse these conditions and to heat the plate4.- to a higher temperature than the other parts of the drum the heatingmedium may be admitted at the opposite end of the shaft 7, so as toreverse the flow. The drum may be driven by an ordinary belt and pulley.(Not shown.)

The vacuum-pan itself, with the exhausting devices, thescraper 13, andreceptacle 14:,

IOO

mounted therein, the hollow drum mounted on and carried by said shaft,said drum hav: ing a hollow, annular space in its rim, a baffie-plate ofcylindrical form in and dividing the said annular space, ports leadingfrom one section of said tubular shaft to the annular space at the innerside of the baffleplate, and ducts connecting the other section of saidshaft with the annular space at the outer side of said baffle-plate,substantially as and for the purpose set forth.

2. In an apparatus for the purpose specified, the combination with thevacuum-pan, of the tubular shaft rotatively mounted therein, said shaftbeing in two alined sections, the hollow hub connecting said sections,said hub having in ita partition 9 and an aperture or port 10 at oneside of said partition, the hollow drum mounted on and carried by saidMARTIN EKENBERG.

Witnesses ERNST SVANQVIST, ROBERT APELGREN.

